Psychedelics are not magic. They typically trigger serotonin receptors.
https://en.wikipedia.org/wiki/Psychedelic_drug
This might be useful for interventions by medical experts. Like narcotics are useful for surgical interventions or antibiotics are useful against bacteria infections.
https://www.livescience.com/16287-mushrooms-alter-personalit...
https://www.rollingstone.com/culture/culture-features/the-ps...
DO NOT use psychedelics to solve your problems or when you are in a bad mood. You risk a bad trip causing PTSD and panic disorder or worse.
https://en.wikipedia.org/wiki/Bad_trip
https://www.reddit.com/r/Drugs/comments/36gj2h/can_ptsd_be_c...
https://psychonautwiki.org/wiki/Set_and_setting#Mental_State
It might work to get out of a rut but, IMO, the risks (what dosage?) are not worth it. Certainly not without professional assistance (not a shaman). The new rut might be much worse than the old rut.
Also: https://www.psychologytoday.com/us/blog/charting-the-depths/...
IMO no problem is solved by psychedelics. Unless you sell them to solve your money problem.
I hate to say this, but I think you can't really speak coherently about psychedelics unless you have personal, first-hand experience.
Still, according to experts and many anecdotes on reddit, psychedelics are very risky (unwanted bad effects) and not safe drugs and not miracle drugs.
The risk of bad short term and long term effects depends highly on the dosage and the personal mindset and the current environment. Nobody knows in advance how your brain will react.
LSD and ecstasy had a profound impact on me to such an extent that I can’t even imagine what my life would be like today without the experiences. I’m almost certain I’d be a less happy, less successful person.
But I’m not exactly going to have a casual conversation about it with someone that I don’t know very well.
As far as Terrence McKenna is concerned, I think the man accomplished a little more than writing profusely about psychedelics. He was a brilliant lecturer. There are probably 100+ of his talks available on YouTube. The topics of those talks often go far beyond mere rambling about psychedelics.